Method for manufacturing secondary battery

Abstract

According to exemplary embodiments of the present invention, provided is a method for manufacturing a secondary battery. The method comprises the steps of: inspecting an electrode sheet to collect coordinate-related inspection data, wherein the coordinate-related inspection data includes a determination value indicating a defect of the electrode sheet and coordinates matched to the determination value; cutting the electrode sheet into first and second separated electrode sheets; winding the first and second separated electrode sheets into first and second separated electrode rolls; and determining the production amount of each of the first and second separated electrode sheets.

Description

Method of manufacturing a secondary battery

[0001] The present invention relates to a method for manufacturing a secondary battery. This application claims the benefit of Korean Application No. 10-2023-0119056, filed September 7, 2023, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] Secondary batteries are manufactured through electrode processes, assembly processes, and activation processes. Among these, the electrode process is the most critical process in determining the yield and performance of the battery cell. The electrode process may include a coating process, a roll-pressing process, and a slitting process. In the coating process, active and insulating materials may be applied to the surface of the current collector. In the roll-pressing process, the electrode may be pressed by pressure rolls. The roll-pressing process may determine the density, performance, and surface quality of the electrode. In the slitting process, the electrode may be cut into multiple electrodes depending on the battery cell design.

[0004] The technical idea of ​​the present invention is to provide a method for manufacturing a secondary battery using a roll map including information on the quality and defects of an electrode manufacturing process.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a method for manufacturing a secondary battery is provided. The method includes the steps of inspecting an electrode sheet to collect coordinate-related inspection data, wherein the coordinate-related inspection data includes a judgment value indicating a defect in the electrode sheet and coordinates matched to the judgment value; cutting the electrode sheet into first and second separated electrode sheets; winding the first and second separated electrode sheets into first and second separated electrode rolls; and determining the production amount of each of the first and second separated electrode sheets.

[0006] The production amount of each of the first and second separated electrode sheets is determined based on the first and second winding amounts, which are the lengths of each of the first and second separated electrode sheets wound onto the first and second separated electrode rolls.

[0007] The method includes a step of calculating an exclusion amount of each of the first and second separated electrode sheets, and the length of a defective portion of each of the first and second separated electrode sheets is added to the exclusion amount of each of the first and second separated electrode sheets.

[0008] The length of the defective portion of the electrode sheet is calculated based on the coordinate-related inspection data.

[0009] The length of the portion removed for sample inspection of each of the first and second separated electrode sheets is added to the exclusion amount.

[0010] The above method further includes a step of calculating a good quantity, which is the length of a normal portion of each of the first and second separated electrode sheets, based on the production amount and the exclusion amount.

[0011] The above quantity of good quality is calculated by subtracting the above quantity excluded from the above production volume.

[0012] According to exemplary embodiments, a method for manufacturing a secondary battery is provided. The method includes: collecting coordinate-associated inspection data of an electrode sheet; cutting the electrode sheet into first and second separated electrode sheets; and calculating a good quantity, which is a length of a normal portion of each of the first and second separated electrode sheets, based on a production amount of each of the first and second separated electrode sheets, a defective quantity, which is a length of a defective portion of each of the first and second separated electrode sheets, and a loss quantity, which is a lost portion of each of the first and second separated electrode sheets, wherein the coordinate-associated inspection data includes a judgment value indicating a defect of the electrode sheet and coordinates matched to the judgment value, and the defective quantity is determined based on the coordinate-associated inspection data.

[0013] The above loss amount is determined based on manually entered data entered by the worker.

[0014] The length of the portion lost by sample inspection and residual removal of each of the first and second separated electrode sheets is added to the above loss amount.

[0015] The production amount of each of the first and second separated electrode sheets is determined based on the first and second winding amounts, which are the lengths of each of the first and second separated electrode sheets wound onto the first and second separated electrode rolls.

[0016] The above quantity of good products is calculated by subtracting the quantity of defective products and loss from the above production volume.

[0017] According to exemplary embodiments of the present invention, a method of manufacturing a secondary battery that enables feedback, feed forward, and tracking of an electrode process may be provided.

[0018] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0019] Figure 1 illustrates a secondary battery manufacturing system according to exemplary embodiments.

[0020] Figure 2 is a plan view showing an electrode sheet.

[0021] Figure 3 shows the first and second separated electrode sheets.

[0022] Figure 4 is a flowchart for explaining a method for manufacturing a secondary battery according to exemplary embodiments.

[0023] Figure 5 shows a screen displayed on a client device.

[0024] FIG. 6 illustrates a secondary battery manufacturing system according to other exemplary embodiments.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0026] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0027] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0028] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0029]

[0030] (Example 1)

[0031] Figure 1 illustrates a secondary battery manufacturing system according to exemplary embodiments.

[0032] Figure 2 is a plan view showing an electrode sheet (ES).

[0033] Figure 3 shows first and second separated electrode sheets (ESa, ESb).

[0034] Referring to FIGS. 1 to 3, a secondary battery manufacturing system (100) may include an unwinder (111), first and second rewinders (113a, 113b), a slitter (115), a rotary encoder (121), first and second rotary encoders (123a, 123b), an inspector (130), a first controller (141), a second controller (143), servers (150, 160), and a client device (170).

[0035] The unwinder (111) may be configured to unwind the electrode sheet (ES) from the electrode roll (ER). First and second separated electrode sheets (ESa, ESb) are provided by cutting the electrode sheet (ES). The first separated electrode sheet (ESa) may be wound onto the first separated electrode roll (ERa) by the first rewinder (113a), and the second separated electrode sheet (ESb) may be wound onto the second separated electrode roll (ERb) by the second rewinder (113b). Accordingly, the electrode sheet (ES) and the first and second separated electrode sheets may move between the unwinder (111) and the first and second rewinders (113a, 113b).

[0036] Electrode rolls (ER) can be provided through a coating process and a roll pressing process. The coating process is a process of applying a coating material, such as electrode slurry, onto an electrode sheet (ES). The electrode slurry may include an electrode active material, a conductive agent, a binder, and a solvent. The electrode slurry can be provided by dissolving the electrode active material, conductive agent, binder, etc. in a solvent.

[0037] An electrode slurry may be coated on an electrode sheet by a coating process. The electrode sheet (ES) may include first and second holding portion lanes (L1, L2) and a non-coated portion (UC). The first and second holding portion lanes (L1, L2) may be portions of the electrode sheet (ES) on which electrode slurry is provided (or includes a coating of electrode slurry). The non-coated portion (UC) may be a portion of the electrode sheet (ES) on which electrode slurry is not provided (or does not have a coating of electrode slurry).

[0038] Each of the first and second maintenance lanes (L1) and the non-conductive portion (UC) may extend in the machine direction (MD), which is the moving direction (or longitudinal direction) of the electrode sheet (ES). The first and second maintenance lanes (L1, L2) and the non-conductive portion (UC) may be separated in the transverse direction (TD) perpendicular to the machine direction (MD) of the electrode sheet (ES) (or, the width direction of the electrode sheet (ES). The first and second maintenance lanes (L1) may be spaced apart in the transverse direction (TD) with the non-conductive portion (UC) therebetween.

[0039]

[0040] In the roll pressing process, an electrode sheet coated with electrode slurry can be passed between pressurized rolls. The roll pressing process can flatten the surface of the electrode sheet and enhance the bonding strength between the active material of the electrode sheet and the current collector.

[0041] A slitting process may be performed on the electrode sheet (ES). The electrode sheet (ES) may be cut into first and second separated electrode sheets (ESa, ESb) by a slitter (115). The slitting process is performed on the electrode sheet (ES) unwound from the electrode roll (ER) and the first and second separated electrode sheets (ESa, ESb) wound onto the first and second separated electrode rolls (ERa, ERb), and the slitting process may be a roll-to-roll process.

[0042] The first separated electrode sheet (ESa) may include a first maintenance lane (L2) and a first uncoated portion (UC1). The second separated electrode sheet (ESb) may include a second maintenance lane (L2) and a second uncoated portion (UC2). As a non-limiting example, the first and second uncoated portions (UC1, UC2) may be provided by separating the uncoated portion (UC) of the electrode sheet (ES).

[0043] The guide roll (116) can define a movement path of the second separated electrode sheet (ESb). Although not illustrated in detail, the secondary battery manufacturing apparatus (100) can include additional guide rolls for defining a movement path of the electrode sheet (ES) and the first and second separated electrode sheets (ESa, ESb). By arranging the additional guide rolls, a movement path of the electrode sheet (ES) and the first and second separated electrode sheets (ESa, ESb) can be designed, and the tension of the electrode sheet (ES) can be maintained while the electrode sheet (ES) and the first and second separated electrode sheets (ESa, ESb) are processed.

[0044] The rotary encoder (121) may be configured to sense the amount of electrode sheets (ES) unwound from the electrode roll (ER) by the unwinder (111). Accordingly, the rotary encoder (121) may be configured to generate an input amount signal (UWAS) indicating the output amount of the electrode sheets (ES). The rotary encoder (121) may be configured to transmit the input amount signal (UWAS) to the first controller (141). The first controller (141) may be configured to collect input amount data based on the input amount signal (UWAS) of the electrode sheets (ES). The input amount data may indicate the length of a material (i.e., an electrode roll (ER)) input into the secondary battery manufacturing system (100) to manufacture a secondary battery.

[0045] The first rotary encoder (123a) may be configured to sense the amount of the first separated electrode sheet (ESa) wound onto the first separated electrode roll (ERa) by the rewinder (113). Accordingly, the first rotary encoder (123a) may be configured to generate a first exhaustion amount signal (WASa) indicating the winding amount of the first separated electrode sheet (ESa). The first rotary encoder (123a) may be configured to transmit the first exhaustion amount signal (WASa) to the first controller (141). The first controller (141) may be configured to collect first exhaustion amount data based on the first exhaustion amount signal (WASa). The first exhaustion amount data may indicate the length of the first separated electrode sheet (ESa) wound by the first rewinder (113a).

[0046] The second rotary encoder (123b) may be configured to sense the amount of the second separated electrode sheet (ESb) wound onto the second separated electrode roll (ERb) by the rewinder (113). Accordingly, the second rotary encoder (123b) may be configured to generate a second exhaustion amount signal (WASb) indicating the winding amount of the second separated electrode sheet (ESb). The second rotary encoder (123b) may be configured to transmit the second exhaustion amount signal (WASb) to the first controller (141). The first controller (141) may be configured to collect second exhaustion amount data based on the second exhaustion amount signal (WASb). The second exhaustion amount data may indicate the amount of the second separated electrode sheet (ESb) wound by the second rewinder (113b).

[0047] As a non-limiting example, the first controller (141) and the second controller (143) may be a Programmable Logic Controller (PLC). A PLC is a specialized type of microprocessor-based controller that uses programmable memory to store commands and implement functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes. PLCs are easy to operate and program.

[0048] The first and second controllers (141, 143) may include a power supply, a CPU, an input interface, an output interface, a communication interface, and memory devices. The power supply may be configured to supply power to other elements of the first and second controllers (141, 143), such as the CPU, the input interface, the output interface, the communication interface, and the memory devices, for the operation of the first and second controllers (141, 143). The memory devices may include a Read Only Memory (ROM) configured to store a system program, such as an operating system, and a Random Access Memory (RAM) configured to store data, such as user programs and status information of input and output devices, timers, counters, and other internal device values. The CPU may be configured to implement logic and control communication between modules that convert input signals into output operation signals. The CPU may operate based on the system program and user programs stored in the memory devices. The CPU may be configured to write or read inspection data and measurement data to the data areas of memory devices based on system programs and user programs. Conditions or data of industrial devices and production processes may be transmitted to the CPU via an input module. Results processed by the CPU may be transmitted to an actuator via an output module. The communication interface may be configured to transmit and receive data between the first and second controllers (141, 143) or between the second controller (143) and the server (150).

[0049] However, the present invention is not limited thereto, and the first and second controllers (141, 143) may include any one of a simple controller, a complex processor such as a microprocessor, a CPU, a GPU, a processor configured by software, dedicated hardware, and firmware. The first and second controllers (141, 143) may also be implemented by, for example, a general-purpose computer or application-specific hardware such as a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit).

[0050] The first controller (141) may be configured to collect coordinate data (CDa, CDb) of the first and second separated electrode sheets (ESa, ESb) based on the first and second exhaustion amount signals (WASa, WASb). The first controller (141) may determine a movement distance of the first separated electrode sheet (ESa) based on the first exhaustion amount signal (WASa), and accordingly, a position of a portion of the first separated electrode sheet (ESa) wound by the first rewinder (113a) at each point in time when the slitting process is performed may be determined within the first separated electrode sheet (ESa). The first controller (141) can determine the movement distance of the second separated electrode sheet (ESb) based on the second exhaustion amount signal (WASb), and accordingly, the position of the portion of the second separated electrode sheet (ESb) wound by the second rewinder (113b) at each point in time when the slitting process is performed can be determined within the second separated electrode sheet (ESb).

[0051] The first coordinate data (CDa) may include coordinates matching each portion of the first separated electrode sheet (ESa). That is, each arbitrary point on the first separated electrode sheet (ESa) may have a coordinate. The coordinates of the first coordinate data (CDa) may be one-dimensional quantities in the driving direction (MD) of the first separated electrode sheet (ESa), but are not limited thereto. The coordinates of the first coordinate data (CDa) may also be two-dimensional quantities in the driving direction (MD) and the transverse direction (TD).

[0052] The second coordinate data (CDb) may include coordinates matching each portion of the second separated electrode sheet (ESb). That is, each arbitrary point on the second separated electrode sheet (ESb) may have a coordinate. The coordinates of the second coordinate data (CDb) may be one-dimensional quantities in the driving direction (MD) of the second separated electrode sheet (ESb), but are not limited thereto. The coordinates of the second coordinate data (CDb) may also be two-dimensional quantities in the driving direction (MD) and the transverse direction (TD).

[0053] The tester (130) may be configured to test the electrode sheet (ES) to collect test data. The tester (130) may include any one of a color sensor, a seam sensor, a reference point sensor, and a vision machine.

[0054] Inspection data may include, for example, data on the appearance of the electrode sheet (ES) collected by an image-based inspection device such as a vision machine, data on breaks and seams of the electrode sheet (ES), data on a portion of the electrode sheet (ES) on which sampling inspection has been performed, data on a portion of the electrode sheet (ES) scheduled to be scrapped, data on a scrapped portion of the electrode sheet (ES), data on the quality of coating materials and insulating layers on the electrode sheet (ES), data on reference points indicating the position of the electrode sheet (ES), and defect data such as pinhole defects, crater defects, line defects, crack defects, side ring defects, island defects, fold defects, wrinkle defects, dent defects, and imprint defects. The inspection data may include a judgment value for the quality of a portion of the electrode sheet (ES) (for example, a value indicating the presence or absence of a defect and the type of defect).

[0055] Here, the data of the appearance of the electrode sheet may include width data of the electrode sheet (ES) determined based on image-based inspection, width data of the insulating layer on the electrode sheet, overlay data indicating an overlapping width of a coating material (i.e., electrode slurry) and the insulating layer on the electrode sheet, and mismatch data indicating a misalignment of a retention lane on the lower surface and a retention lane on the upper surface of the electrode sheet (ES). In addition, reference points may be formed at predetermined intervals on the electrode sheet (ES), and the positions of other elements on the electrode sheet (ES) may be located based on the reference points. As a non-limiting example, the secondary battery manufacturing system may include a separate server configured to store original inspection data (e.g., an image of a defective portion of the electrode sheet (ES)).

[0056] The inspection data may include dimensional data such as width data of the retention lanes and non-retaining portions of the electrode sheet (ES), width of the insulating layer and overlapping width between the coating material and the insulating layer, and mismatch data between the retention lanes on the upper surface of the electrode sheet (ES) and the retention lanes on the lower surface of the electrode sheet (ES), which are determined based on an image-based inspection of the electrode sheet (ES).

[0057] The tester (130) may include a sensing unit (131) and a processor (133). The sensing unit (131) may be configured to sense a physical quantity of an electrode sheet (ES) to generate a measurement signal (MS). For example, the sensing unit (131) may include a Time Delay and Integration (TDI) camera, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, and a Time of Flight (TOF) sensor. The sensing unit (131) may also include an emitter and a receiver configured to perform measurements using non-destructive signals such as ultrasound, microwaves, terahertz waves, and infrared rays. The sensing unit (131) may also include analog and / or digital sensors such as a biosensor, a chemical sensor, a composition sensor, a current and / or power meter, an air quality sensor, a gas sensor, a Hall effect sensor, a brightness level sensor, and a light sensor. The sensing unit (131) may include a pressure sensor, a temperature sensor, an ultrasonic sensor, a proximity sensor, a door status sensor, a motion tracking sensor, a humidity sensor, a visible light and infrared sensor, and a camera.

[0058] The processor (133) may be configured to receive and process a circular inspection signal (IS) sensed by the sensing unit (131S) to collect inspection data. The processor (133) may include an algorithm for processing an image of a portion of the electrode sheet (ES) to determine an inspection value of the inspection data, or a model (e.g., an artificial neural network) trained to determine an inspection value based on an image of a portion of the electrode sheet (ES).

[0059] The inspection data may be time-series data. The inspection data may be temporally ordered. The inspection data may be indexed by time. The inspection data may include judgment values ​​determined by the processor (133) and a time value (or time values) matching the judgment values. That is, the inspection data may be stored based on the time at which the inspection was performed, and the inspection data may be associated with time. The time values ​​of the measurement data and the inspection data may, for example, be in the form of a timestamp, but are not limited thereto.

[0060] For example, the inspection data may have a value indicating a defect in each of the first and second maintenance lanes (L1, L2) and a time value associated with the value indicating the defect. Here, indicating a defect includes at least one of the presence or absence of a defect and the type of defect.

[0061] The first controller (141) may be in operative communication with the rotary encoder (121), the first and second rotary encoders (123a, 123b), the tester (130), and additional measuring instruments and testers via a wired or wireless data network. The data network may be unidirectional or bidirectional. The data network may be implemented by a public network and / or a specialized network using a physical channel, WiFi, Bluetooth, and / or other frequency bands. The rotary encoder (121), the first and second rotary encoders (123a, 123b), the tester (130), and additional measuring instruments and testers may be configured to collect data from equipment, workpieces, semi-finished products, and products within the secondary battery manufacturing system (100), or to generate signals for collecting data. The first controller (141) may be configured to transmit first and second coordinate data (CDa, CDb) to the processor (133).

[0062] The processor (133) may be configured to collect first and second coordinate-related inspection data (CIDa, CIDb) based on the inspection data and the first and second coordinate data (CDa, CDb). The first coordinate-related inspection data (CIDa) may include a judgment value indicating the presence or absence and type of a defect on the first maintenance lane (L1) and a coordinate matching the judgment value. The second coordinate-related inspection data (CIDb) may include a judgment value indicating the presence or absence and type of a defect on the second maintenance lane (L2) and a coordinate matching the judgment value.

[0063] According to exemplary embodiments, the processor (133) may be configured to calibrate the first and second coordinate data (CDa, CDb) based on the position of the sensing unit (131). More specifically, the processor (133) may be configured to correlate the coordinates of the first and second coordinate data (CDa, CDb) with the judgment values ​​of the inspection data by calibrating the first and second coordinate data (CDa, CDb) based on offset lengths. Here, each of the offset lengths may be a length of a portion of the electrode sheet (ES) that is reopened between the first and second rewinders (113a, 113b) and the portion of the electrode sheet (ES) detected by the sensing unit (131) and portions of the first and second separated electrode sheets (ESa, ESb).

[0064] The inspection device (130) can collect inspection data of a portion of the electrode sheet (ES) corresponding to (e.g., overlapping) the sensing unit (131), and the first and second coordinate data (CDa, CDb) are collected by first and second rotary encoders (123a, 123b) spaced apart from the sensing unit (131). Accordingly, the portion of the electrode sheet (ES) corresponding to the first and second coordinate data (CDa, CDb) collected at the same point in time and the portion of the electrode sheet (ES) corresponding to the inspection data may be different.

[0065] According to exemplary embodiments, first and second coordinate-related inspection data (CIDa, CIDb) can be provided by correcting first and second coordinate data (CDa, CDb) collected at the same time as inspection data based on an offset length, and associating the corrected first and second coordinate data (CDa, CDb) with measurement data. The coordinate-related inspection data (CID) can include judgment values, times and coordinates matched to the judgment values. In the first and second coordinate-related inspection data (CIDa, CIDb), each of the judgment values ​​may be matched with a single coordinate of each of the first and second separated electrode sheets (ESa, ESb), or may be matched with a start coordinate and an end coordinate defining a section of each of the first and second separated electrode sheets (ESa, ESb).

[0066] The secondary battery manufacturing system (100) may further include a measuring device configured to measure a physical quantity of the electrode sheet (ES), such as a loading amount of electrode slurry on the electrode sheet (ES) or a thickness of the electrode sheet (ES). The measuring device may include a sensing unit configured to generate a measuring signal and a processor configured to process the measuring signal to generate coordinate-related measuring data. The generation of the coordinate-related measuring data includes matching the measuring data with first and second coordinate data (CDa, CDb), and the coordinate data may be corrected based on an offset distance of the sensing unit of the measuring device for matching the measuring data with the first and second coordinate data (CDa, CDb). The processor of the measuring device may calculate an evaluation value for a measured section of the electrode sheet based on the circular measuring data, and the judgment value may be matched with a start coordinate and an end coordinate defining the measured section of the electrode sheet.

[0067] For example, if the measured amount of the coating material on the electrode sheet (ES) (e.g., the loading amount on the electrode sheet (ES) or the thickness of the electrode sheet (ES)) is within a set range including an upper limit and a lower limit, the corresponding portion of the electrode sheet (ES) can be determined as a good product. If the measured amount of the coating material on the electrode sheet (ES) (e.g., the loading amount on the electrode sheet (ES) or the thickness of the electrode sheet (ES)) is less than the lower limit or greater than the upper limit, the corresponding portion of the electrode sheet (ES) can be determined as a defective product.

[0068] As another example, a measurement value (or representative value) within a first range may be determined as normal, a measurement value (or representative value) within a second range that is greater than the first range may be determined as excessive, a measurement value (or representative value) within a third range that is greater than the second range may be determined as very excessive, a measurement value (or representative value) within a fourth range that is smaller than the first range may be determined as insufficient, and a measurement value (or representative value) within a fifth range that is smaller than the fourth range may be determined as very insufficient.

[0069] Here, if the lower limit of the second range is greater than or equal to the upper limit of the first range, the second range is greater than the first range. Similarly, if the upper limit of the fourth range is less than or equal to the lower limit of the first range, the fourth range is less than the first range.

[0070] The processor (133) may be configured to generate first and second failure indication signals (TCDa, TCDb) based on first and second coordinate-related inspection data (CIDa, CIDb). The processor (133) may be configured to transmit the first failure indication signal (TCDa) to the first marker (117a). The processor (133) may be configured to transmit the second failure indication signal (TCDb) to the second marker (117b).

[0071] The first marker (117a) may be configured to provide a failure indicator (DI) to the first separated electrode sheet (125a) based on the first failure indication signal (TCDa). The failure indicator (DI) may be provided to the first uncoated portion (UC1) of the first separated electrode sheet (125a).

[0072] The second marker (117b) may be configured to provide a failure indicator (DI) to the second separated electrode sheet (125b) based on the second failure indication signal (TCDb). The failure indicator (DI) may be provided to the second uncoated portion (UC2) of the second separated electrode sheet (125b).

[0073] For example, the defective indicator (DI) may be a defective tag and may have a color that is distinct from the electrode sheet (ES). In this case, each of the first and second markers (117a, 117b) may be a defective tag attacher.

[0074] As another example, the defect indicator (DI) may be a defect mark, may include a symbol, or may be a one-dimensional or two-dimensional barcode. In this case, each of the first and second markers (117a, 117b) may be a printing device, such as a laser printer or an ink printer.

[0075] The secondary battery manufacturing system (100) may further include an input device that allows manual input of data by a worker, such as, for example, a Human Machine Interface (HMI). Alternatively, the secondary battery manufacturing system (100) may allow computer-based input of manufacturing data, such as data input by a worker using an input tool and scraping of an Excel file. The manually input data (MID) may include, for example, the length, start coordinates, and end coordinates of an electrode sheet (ES) cut by a sample inspection of the electrode sheet (ES), or the length, start coordinates, and end coordinates of an electrode sheet (ES) lost in a lot replacement (i.e., loading a new electrode roll (ER)). The input device may be configured to transmit the manually input data (MID) to the first controller (141). Alternatively, the input device may transmit the manually input data (MID) to the second controller (143) or directly to the server (150).

[0076] The first controller (141) may be configured to transmit the first and second coordinate-related inspection data (CIDa, CIDb) and the manual input data (MID) to the second controller (143). The second controller (143) may be configured to transmit the first and second coordinate-related inspection data (CIDa, CIDb) and the manual input data (MID) to the server (150). However, the present invention is not limited thereto, and the first controller (141) may also directly transmit the first and second coordinate-related inspection data (CIDa, CIDb) and the manual input data (MID) to the server (150).

[0077] The second controller (143) may be configured to control the operation of the unwinder (111), the rewinder (113), and the slitter (115). The second controller (143) may be configured to generate signals for operation and stop of the unwinder (111), the rewinder (113), and the slitter (115). The signals for operation and stop of the unwinder (111), the rewinder (113), and the coaters (115T, 115B) may be generated based on the first and second coordinate-related inspection data (CIDa, CIDb) and the manual input data (MID).

[0078] The first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID) can be transmitted to the server (160) via the server (150). The server (150) can be, for example, a server for communication based on log data. The server (150) can be a program for communication between the second controller (143) and the server (160) for manufacturing management. The server (150) can also be implemented in hardware. The language and protocol of the server (160) can be different from the language and protocol of the controller (143). For example, the language of the server (160) can be SQL, and the language of the controller (143) can be a ladder diagram.

[0079] The server (150) may be configured to convert electrode specification data transmitted from the server (160) into the language of the second controller (143). In addition, the server (150) may be configured to convert the first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID) into the language of the server (160), and record the first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID) in the database of the server (160).

[0080] Electrode specification data may include model information and recipe of the electrode sheet (ES). The electrode specification data may include all matters related to processing of the electrode sheet (ES), such as the number of lots being processed in the current process, the number of maintenance lanes formed on the electrode sheet (ES), process conditions including temperature, humidity, and pressure, the moving speed of the electrode sheet (ES), the discharge amount of the coating die, and the pressure of the pressurizing rolls.

[0081] In order to control the process, a communication line may be installed between the second controller (143) and the server (160) via the server (150) and connecting the second controller (143) and the server (160). Accordingly, data transmission through the second controller (143) can reduce resources required for installation of the communication line and can improve data processing and management efficiency compared to the case where the first and second rotary encoders (121, 123) and the inspector (130) directly transmit the input amount signal (UWS), the exhaustion amount signal (WS) and the first and second coordinate-related inspection data (CIDa, CIDb) to the server (150) and the case where the first controller (141) directly transmits the first and second coordinate-related inspection data (CIDa, CIDb) to the server (160).

[0082] According to exemplary embodiments, the server (160) may be a data processing system that supports various activities necessary for managing the manufacturing of secondary batteries, such as work schedule management, work instructions, quality control, and work performance aggregation. The server (160) may be, for example, a Manufacturing Execution System (MES). The server (160) may be configured to input, process, output, and communicate data necessary for electrode manufacturing processes, such as a coating process, a roll pressing process, and a slitting process.

[0083] The server (160) may be configured to generate a roll map. The roll map may include data regarding specifications of the lot. The specifications of the lot may include, for example, a lot number, the length of the rolled electrode sheet (ES), the width of the electrode sheet (ES), and the materials and compositions used in processing the electrode sheet (ES).

[0084] The roll map can represent the electrode sheet (ES) based on coordinates indicating the location on the electrode sheet (ES). A process for manufacturing a secondary battery can be performed on the electrode sheet (ES), as described above. The roll map can represent the history of the process performed on the electrode sheet (ES) and include data associated with the coordinates. Accordingly, the roll map enables feedback, feedforward, and tracking of the secondary battery manufacturing process, as described below.

[0085] A roll map may include event data representing events in a roll-to-roll process of an electrode sheet (ES). Event data typically occurs as the process progresses, and thus is time-series data. Accordingly, data on process events may include values ​​representing the events and time values ​​associated with them. Time-series data may be temporally ordered. Temporal ordering, a key characteristic of time-series data, organizes events in the order in which they occur and arrive for processing. In other words, time-series data may be stored based on the time at which an event occurs (i.e., when inspection and measurement are performed, or when process actions are performed), and events may be associated with time values.

[0086] The manufacturing of secondary batteries involves a series of different processes, with the leading process influencing the following process. Feedforward refers to the correction of the following process based on data generated based on the results of the preceding process. However, if the time series data of the preceding process does not directly match the real-world workpieces, semi-finished products, and finished products, it is difficult to reflect the time series data of the preceding process in the following process. Here, the workpiece refers to an article provided as a result of each process, such as the electrode sheet (ES) and the first and second separated electrode sheets (ESa, ESb) that have undergone the coating process, roll pressing process, and slitting process illustrated in FIG. 1. The semi-finished product may refer to one of separators, electrodes, and assemblies thereof cut through a notching process. The semi-finished product may also be a structure comprising a housing and an electrode assembly embedded in the housing (in some cases, the structure further includes an electrolyte). The product refers to an article that has been processed to be operable as a secondary battery through an activation process. The definitions of work-pieces, semi-finished products and finished products set forth above are only one aspect of these and do not exclude the usual definitions of these.

[0087] For feedforward, time-series data must be associated with the positions of real-world workpieces, parts, semi-finished products, and finished products. In a roll map, time-series data, such as measurement data, can be associated with first and second coordinate data (CDa, CDb) based on the movement amount (i.e., either the input or output amount) of the electrode sheet (ES). The roll map can associate the time-series data with first and second coordinate data (CDa, CDb) that include coordinates representing the positions of real-world workpieces, parts, semi-finished products, and finished products. Accordingly, the creation of a roll map and feedforward based on the roll map can quantify and objectify aspects of the process previously dependent on the operator's discretion, thereby improving production efficiency and quality.

[0088] A roll map can be generated on a lot basis. The electrode sheet (ES) is wound onto first and second separated electrode rolls (ERa, ERb), and after reaching a winding amount target, the first and second separated electrode rolls (ERa, ERb) are cut and separated from the first and second separated electrode sheets (ESa, ESb) connected to the first electrode roll (ER). A lot is a production unit of a roll-to-roll process, and the first and second separated electrode sheets (ESa, ESb) and the separated second electrode roll (ER2) are an example of a lot. Accordingly, the server (160) can be configured to store a roll map of a previous process. The roll map of the previous process can correspond to the electrode roll (ER). In addition, the server (160) can be configured to generate and store a roll map of a current process. The roll map of the current process can correspond to the first and second separated electrode rolls (ERa, ERb).

[0089] Additionally, the roll map of a preceding lot can be used to improve the process for subsequent lots, an action referred to as process feedback. Process feedback using a roll map can include identifying process conditions and parameters that caused problems and defects based on the data contained in the roll map.

[0090] Furthermore, the roll map is cumulatively generated for work-pieces, parts, semi-finished products, and finished products of unit processes, thereby enabling tracking of the process history of shipped products (e.g., battery cells, battery modules, or battery packs). For example, a battery cell may include a cell ID formed on an electrode assembly or case. The cell ID may be matched to the lot number and coordinate information of the electrodes and separator included in the battery cell. In other words, the cell ID may be associated with the roll map of the electrodes and separator included in the battery cell. Accordingly, if an event such as a quality issue occurs in a battery cell that has already been shipped, the history of collective data of the manufacturing of the corresponding battery cell can be retrieved based on the cell ID.

[0091] The server (160) can provide production management based on data from the roll map, such as first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID). The server (160) can be configured to determine or calculate, for example, the production volume, good quantity, defective quantity, and loss quantity of the coating process.

[0092] Here, the production amount of the slitting process can be determined based on the winding amount by the first and second rewinders (123a, 123b). The production amount of the first separated electrode roll (ERa) can be the length of the first separated electrode sheet (ESa) wound by the first rewinder (123a) detected by the first rotary encoder (123a). The production amount of the second separated electrode roll (ERb) can be the length of the second separated electrode sheet (ESb) wound by the second rewinder (123b) detected by the second rotary encoder (123b).

[0093] The quantity of good products can be calculated by subtracting the quantity of defective products and losses from the quantity of production. Accordingly, the relationship among the quantity of production, quantity of good products, quantity of defective products, and quantity of losses can follow Equation 1 below. Accordingly, the server (160) can be configured to automatically calculate the quantity of good products in the slitting process, as an example of production management based on a roll map.

[0094] [Formula 1]

[0095] Production = Amount of good products + Amount of defective products + Amount of loss

[0096] The portion of the electrode sheet (ES) corresponding to the defective amount and the loss amount can be removed in a subsequent process or separated from the normal electrode sheet (ES). The defective amount and the loss amount can be collectively referred to as the exclusion amount. That is, the exclusion amount can satisfy the following equations 2 and 3.

[0097] [Formula 2]

[0098] Exclusion amount = defective amount + loss amount

[0099] [Formula 3]

[0100] Production volume - exclusion volume = quality volume

[0101] In another example, according to exemplary embodiments, the server (160) may be a Statistical Process Controller (SPC). The server (160) can continuously monitor the processing of the electrode sheet (ES) based on original inspection data and / or measurement data, thereby managing the quality of the processing of the electrode sheet (ES). By collecting and analyzing manufacturing data in near real-time, the server (160) can promptly identify problem conditions and provide alerts to operators before potential problems occur.

[0102] In another example, the server (160) may be a data warehouse configured to store data of the roll map for a long period of time, such as first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID).

[0103] The client device (170) may be configured to transmit an API request to the server (160) to retrieve information about the roll map. The server (160) may be configured to transmit, in response to the API request of the client device (170), a Uniform Resource Locator (URL) (or schema) containing source code for displaying the roll map on the client device (170). The client device (170) may access the source code for visualizing and displaying the roll map through the URL (or schema).

[0104] The client device (170) may be any device capable of communicating with the server (160), such as a workstation computer, a laptop, a desktop computer, a tablet, a mobile device such as a smart phone, a wearable device, etc. The client device (170) may include input tools for entering API requests and a display device for displaying a roll map.

[0105] The processing unit (133) and the servers (150, 160) may be implemented by hardware, firmware, software, or a combination thereof. For example, the processing unit (133) and the servers (150, 160) may include computing devices such as workstation computers, desktop computers, laptop computers, and tablet computers. The processing unit (133) and the servers (150, 160) may also include any one of a simple controller, a complex processor such as a microprocessor, a CPU, a GPU, a processor configured by software, dedicated hardware, and firmware. The processing unit (133) and the servers (150, 160) may be implemented by, for example, a general-purpose computer or application-specific hardware such as a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and an ASIC (Application Specific Integrated Circuit).

[0106] The servers (150, 160) may include physical servers or cloud servers. The servers (150, 160) may provide data and analysis results to workers via various frameworks. The frameworks may include protocols that support data transmission, allowing client devices (170) to visualize data through a user interface and provide updated visualizations when new data is calculated by the server (160). The protocols that support the data transmission may use HTML, JavaScript, and / or JSON.

[0107] The servers (150, 160) may include various Application Programming Interfaces (APIs) for storing data in databases and other data management tools. The APIs may also be used to retrieve data from databases in various data management systems. The data management systems may provide access to the databases, pull data from the databases, retrieve data, and generate metrics. Metrics are tools for visualizing data. Metrics include time-series measurements and can be used for monitoring applications and generating status alerts.

[0108] According to some embodiments, the operations of the processing unit (133) and the servers (150, 160) may be implemented as instructions stored on a machine-readable medium that can be read and executed by one or more processors. Here, the machine-readable medium may include any mechanism for storing and / or transmitting information in a form readable by a machine (e.g., a computing device). For example, the machine-readable medium may include a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk storage medium, an optical storage medium, a flash memory, an electrical, optical, acoustical or other form of radio signal (e.g., a carrier wave, an infrared signal, a digital signal, etc.), and any other signal.

[0109] The processing unit (133) and servers (150, 160) may be configured with firmware, software, routines, and instructions for performing the operations described above or any of the processes described below. For example, the processing unit (133) and servers (150, 160) may be instantiated within memory.

[0110] However, this is for convenience of explanation, and the operations of the above-described processing unit (133) and servers (150, 160) may also be caused by other devices that execute computing devices, distributed computing devices, processors, firmware, software, routines, and commands.

[0111] The secondary battery manufacturing system (100) can implement a plug-in architecture with an API for data acquisition to provide plug-and-play connectivity for the tester (130), additional measuring instruments, and additional testers. This allows resources from a specific process step and site to be easily transferred to other processes and sites, or new resources to be easily introduced to each process step and site.

[0112] The data network between elements of the secondary battery manufacturing system (100) may include various types of communication channels, including unidirectional, bidirectional wired, and wireless communications. For example, the data network may include an industrial protocol network such as OPC, Modbus, ProfiNet, etc. The communication channel may be a dedicated conduit communication such as Universal Serial Bus (USB), IEEE 802 (Ethernet), IEEE 1394 (FireWire), or other high-speed data communication standards.

[0113] The architecture configured to generate roll maps and intermediate roll maps can be implemented by simply adding a first controller (141) to the essential elements of a modern process management system. That is, the system according to exemplary embodiments can utilize resources of existing manufacturing sites and reduce additional capital expenditures. Furthermore, by applying the same architecture to newly constructed manufacturing facilities as to existing manufacturing facilities, the reliability of secondary battery manufacturing, the discovery / improvement of problematic processes, and the introduction of new processes can be improved.

[0114]

[0115] (Example 2)

[0116] Figure 4 is a flowchart for explaining a method for manufacturing a secondary battery according to exemplary embodiments.

[0117] Figure 5 shows a screen (SCR) displayed on a client device (170).

[0118] Referring to FIGS. 1, 2, and 4, electrode sheet (ES) data can be collected at P110. The data of the electrode sheet (ES) may be data for evaluating a coating process performed on the electrode sheet (ES). The data of the electrode sheet (ES) may be data for generating a roll map. The data of the electrode sheet (ES) may include coordinate-related data, such as first and second coordinate-related inspection data (CIDa, CIDb) and manual input data (MID) of the electrode sheet (ES). The data of the electrode sheet (ES) may be data for generating a roll map.

[0119] Referring to FIGS. 1, 3, and 4, the electrode sheet (ES) can then be cut into first and second separated electrode sheets (ESa, ESb) at P120. The electrode sheet (ES) can be cut by a slitter.

[0120] Next, at P130, a defect indicator (DI) can be provided to the first and second separated electrode sheets (ESa, ESb). The defect indicator (DI) can be provided by the first and second markers (117a, 117b). The first and second markers (117a, 117b) can provide the defect indicators (DI) to the first and second uncoated portions (UC1, UC2) of the portions including the defects of the first and second separated electrode sheets (ESa, ESb) based on first and second defect indication signals (TCDa, TCDb) generated based on first and second coordinate-related inspection data (CIDa, CIDb).

[0121] Next, at P140, a roll map can be generated. The generation of the roll map can include collectively storing, processing, modifying, and transmitting the coordinates of the first and second coordinate-related inspection data (CIDa, CIDb) and the manually input data (MID), and generating a URL that can access them. By collectively storing, processing, modifying, and transmitting the first and second coordinate-related inspection data (CIDa, CIDb) and the manually input data (MID), the types of defects can be spatially (i.e., based on the coordinates). Accordingly, the length of the portion corresponding to each defect of the electrode sheet (ES) can be prevented from being repeatedly added when calculating the amount of defects.

[0122] Next, at P150, the production amount of each of the first and second separated electrode sheets (ESa, ESb) can be calculated. The production amount of each of the first and second separated electrode sheets (ESa, ESb) can be determined based on the first and second winding amount signals (WASa, WASb). The production amount of each of the first and second separated electrode sheets (ESa, ESb) can be the length of each of the first and second separated electrode sheets (ESa, ESb) wound by the first and second rewinders (113a, 113b).

[0123] Next, referring to FIGS. 1, 4 and 5, at P160, the loss amount and the defective amount of each of the first and second separated electrode sheets (ESa, ESb) can be calculated.

[0124] The loss amount of each of the first and second separated electrode sheets (ESa, ESb) can be determined based on manually input data (MID). For example, the length of the first and second separated electrode sheets (ESa, ESb) can be added to the loss amount for sample inspection and residual removal. Sample inspection and residual removal can be determined based on manually input data (MID).

[0125] Data of a roll map, such as first and second coordinate-associated inspection data (CIDa, CIDb) and manual input data (MID), can be visualized in a first visualized electrode sheet (VESa) and a second visualized electrode sheet (VESb) displayed on a screen (SCR). More specifically, the first visualized electrode sheet (VESa) can visualize coordinate-associated data of a separated first separated electrode sheet (ESa) including first coordinate-associated inspection data (CIDa), and the second visualized electrode sheet (VESb) can visualize coordinate-associated data of a separated second separated electrode sheet (ESb) including second coordinate-associated inspection data (CIDb).

[0126] As shown in the legend (LG) of Fig. 5, the color (C1) indicates that a portion of the first and second separated electrode sheets (ESa, ESb) is normal, and the color (C2) indicates that a portion of the first and second separated electrode sheets (ESa, ESb) is lost due to sample inspection or residual removal. Symbols (I1) having a hollow triangle shape indicate defects of the first and second separated electrode sheets (ESa, ESb) determined based on an external inspection of the first and second separated electrode sheets (ESa, ESb) by a vision machine or the like.

[0127] The defective amount can be determined from portions of the first and second separated electrode sheets (ESa, ESb) that are not included in the calculation of the loss amount. For example, portions included in the loss amount, such as portions indicated by the second color (C2), may not be included in the defective amount even if they contain defects.

[0128] For example, in FIG. 5, one of the symbols (I1) of the first visualized electrode sheet (VESa) may not be added to the defective quantity because it is located in a portion indicated by the second color (C2). Accordingly, the defective quantity of the first visualized electrode sheet (VESa) illustrated in FIG. 5 may be dX.

[0129] Some defects may overlap in the transverse direction (TD). Since the amount of defects is the actual length of the portion containing the defects in the first and second separated electrode sheets (ESa, ESb), they may not be added together in an overlapping manner despite the transverse direction (TD) overlap of the defects.

[0130] Each of the symbols (I1) of the second visualized electrode sheet (VESb) has a defective length (or a distance cut to remove a defect) dX, but they are arranged adjacently so that the defective lengths overlap. Accordingly, the defective amount of the second visualized electrode sheet (VESb) illustrated in Fig. 5 can be calculated as in Equation 4 below.

[0131] [Formula 4]

[0132] Defect amount = dx + dx - ΔX

[0133] As described above, based on the data of the roll map, the server (160) can be configured to determine the production amount, defective amount, and good amount of each of the first and second separated electrode sheets (ESa, ESb), and the production performance (i.e., good amount) of each of the first and second separated electrode sheets (ESa, ESb) can be determined automatically and with high precision.

[0134] Next, at P170, the yield of each of the first and second separated electrode sheets (ESa, ESb) can be calculated. The yield of the coating process can be calculated based on the production amount, loss amount, and defective amount. More specifically, the yield of the coating process can be calculated by subtracting the exclusion amount of the coating process (i.e., the sum of the loss amount and defective amount) from the production amount of the coating process.

[0135]

[0136] (Example 3)

[0137] FIG. 6 illustrates a secondary battery manufacturing system (101) according to other exemplary embodiments.

[0138] Referring to FIG. 6, the secondary battery manufacturing system (101) may include an unwinder (111), first and second rewinders (113a, 113b), a slitter (115), a rotary encoder (121), first and second rotary encoders (123a, 123b), an inspector (130), a processor (135), a first controller (141), a second controller (143), an input device (150), and servers (150, 160).

[0139] The secondary battery manufacturing system (101) includes an unwinder (111), first and second rewinders (113a, 113b), a slitter (115), a rotary encoder (121), first and second rotary encoders (123a, 123b), an inspector (130), a first controller (141), a second controller (143), an input device (150), and servers (150, 160) that are substantially the same as those described with reference to FIGS. 1 to 3, and thus a redundant description thereof is omitted.

[0140] The processor (135) may be an inspection master processor. In addition to the inspection device (130), the processor (135) may be configured to collect, process, modify, store, and transmit inspection data collected from additional inspection devices. Accordingly, the processing, processing, modifying, storing, and transmitting of data collected in the secondary battery manufacturing system (100) may be facilitated.

[0141] In this example, the processor (133) collects inspection data (ID), and the inspection data can be transmitted to the processor (135). The processor (135) can be configured to generate (or collect) first and second coordinate-related inspection data (CIDa, CIDb) based on the first and second coordinate data (CDa, CDb) and the inspection data transmitted from the first controller (141). The processor (135) can be configured to transmit the first and second coordinate-related inspection data (CIDa, CIDb) to the first controller (141) and the processor (133).

[0142]

[0143] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A step of inspecting an electrode sheet to collect coordinate-related inspection data, wherein the coordinate-related inspection data includes a judgment value indicating a defect in the electrode sheet and coordinates matched to the judgment value; A step of cutting the electrode sheet into first and second separated electrode sheets; A step of winding the first and second separated electrode sheets into first and second separated electrode rolls; and A method for manufacturing a secondary battery, comprising the step of determining the production amount of each of the first and second separated electrode sheets.

2. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the production amount of each of the first and second separated electrode sheets is determined based on the first and second winding amounts, which are the lengths of each of the first and second separated electrode sheets wound onto the first and second separated electrode rolls.

3. In paragraph 1, A step of calculating the exclusion amount of each of the first and second separated electrode sheets, and A method for manufacturing a secondary battery, characterized in that the length of the defective portion of each of the first and second separated electrode sheets is added to the exclusion amount of each of the first and second separated electrode sheets.

4. In paragraph 3, A method for manufacturing a secondary battery, characterized in that the length of the defective portion of the electrode sheet is calculated based on the coordinate-related inspection data.

5. In paragraph 3, A method for manufacturing a secondary battery, characterized in that the length of the portion removed for sample inspection of each of the first and second separated electrode sheets is added to the exclusion amount.

6. In paragraph 5, A method for manufacturing a secondary battery, further comprising a step of calculating a good quantity, which is the length of a normal portion of each of the first and second separated electrode sheets, based on the production amount and the exclusion amount.

7. In paragraph 6, A method for manufacturing a secondary battery, characterized in that the above-mentioned quantity of good quality is calculated by subtracting the above-mentioned excluded quantity from the above-mentioned production quantity.

8. A step of collecting coordinate-related inspection data of the electrode sheet; A step of cutting the electrode sheet into first and second separated electrode sheets; A step of calculating a good quantity, which is the length of a normal portion of each of the first and second separated electrode sheets, based on the production amount of each of the first and second separated electrode sheets, a defective quantity, which is the length of a defective portion of each of the first and second separated electrode sheets, and a loss quantity, which is the lost portion of each of the first and second separated electrode sheets, The above coordinate-related inspection data includes a judgment value indicating a defect in the electrode sheet and coordinates matching the judgment value, and A method for manufacturing a secondary battery, characterized in that the above defect amount is determined based on the inspection data associated with the coordinates.

9. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the above loss amount is determined based on manually input data entered by a worker.

10. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the length of the portion lost by sample inspection and residual amount removal of each of the first and second separated electrode sheets is added to the loss amount.

11. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the production amount of each of the first and second separated electrode sheets is determined based on the first and second winding amounts, which are the lengths of each of the first and second separated electrode sheets wound into the first and second separated electrode rolls.

12. In paragraph 8, A method for manufacturing a secondary battery, characterized in that the above-mentioned quantity of good products is calculated by subtracting the above-mentioned quantity of defective products and the above-mentioned quantity of loss from the above-mentioned quantity of production.

Images